seal off
Verb
Meaning
impose a blockade on
make tight; secure against leakage
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Examples
Under norms of rationality, organizations seek to seal off their core technologies from environmental influences.
I had to seal off my feelings about Stevie while seeing her every day and having to help her, too. But you get on with it. What was happening to the band was much bigger than any of that.
seal the windows
A group of soldiers seal off a main road to the parliament building within the military activities taking place in Harare, Zimbabwe on November 15, 2017.
Cid: Once you breach surface, I'll seal off that hold for good--with this!
All you need to seal off the chilly breeze is a door stopper.